/*
 * Copyright (C) 2010-2018 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
 */
package org.evosuite.seeding.factories;

import org.evosuite.Properties;
import org.evosuite.ga.ChromosomeFactory;
import org.evosuite.ga.metaheuristics.GeneticAlgorithm;
import org.evosuite.runtime.Random;
import org.evosuite.testcase.TestCase;
import org.evosuite.testsuite.TestSuiteChromosome;
import org.evosuite.utils.Randomness;

import java.util.List;

/**
 * @author Thomas White
 */
public class RandomMethodSeedingTestSuiteChromosomeFactory implements
        ChromosomeFactory<TestSuiteChromosome> {

    private static final long serialVersionUID = 1L;

    private final ChromosomeFactory<TestSuiteChromosome> defaultFactory;
    private final GeneticAlgorithm<TestSuiteChromosome> geneticAlgorithm;

    /**
     * <p>
     * Constructor for JUnitTestSuiteChromosomeFactory.
     * </p>
     *
     * @param defaultFactory a {@link org.evosuite.ga.ChromosomeFactory} object.
     */
    public RandomMethodSeedingTestSuiteChromosomeFactory(
            ChromosomeFactory<TestSuiteChromosome> defaultFactory,
            GeneticAlgorithm<TestSuiteChromosome> geneticAlgorithm) {
        this.defaultFactory = defaultFactory;
        this.geneticAlgorithm = geneticAlgorithm;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.evosuite.ga.ChromosomeFactory#getChromosome()
     */

    /**
     * {@inheritDoc}
     */
    @Override
    public TestSuiteChromosome getChromosome() {
        /*
         * double P_delta = 0.1d; double P_clone = 0.1d; int MAX_CHANGES = 10;
         */

        TestSuiteChromosome chromosome = defaultFactory.getChromosome();

        int numTests = chromosome.getTests().size();

        //reduce seed probablility by number of tests to be generated
        final double SEED_CHANCE = Properties.SEED_PROBABILITY / numTests;

        for (int i = 0; i < numTests; i++) {
            if (geneticAlgorithm != null && Randomness.nextDouble() < SEED_CHANCE) {
                int populationSize = geneticAlgorithm.getPopulation().size();
                TestSuiteChromosome tsc = geneticAlgorithm.getPopulation().get(Randomness.nextInt(populationSize));
                int testSize = tsc.getTests().size();
                TestCase test = tsc.getTests().get(Random.nextInt(testSize));
                if (test != null) {
                    List<TestCase> tests = chromosome.getTests();
                    tests.remove(i);
                    tests.add(i, test);
                    chromosome.clearTests();
                    for (TestCase t : tests) {
                        chromosome.addTest(t);
                    }
                }
            }
        }

        return chromosome;
    }

}
